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#include <Parsers/Access/ASTCreateRowPolicyQuery.h>
#include <Parsers/Access/ASTRolesOrUsersSet.h>
#include <Parsers/Access/ASTRowPolicyName.h>
#include <Parsers/formatAST.h>
#include <Common/quoteString.h>
#include <IO/Operators.h>
#include <base/range.h>
#include <boost/container/flat_set.hpp>
#include <boost/range/algorithm/transform.hpp>
namespace DB
{
namespace
{
void formatRenameTo(const String & new_short_name, const IAST::FormatSettings & settings)
{
settings.ostr << (settings.hilite ? IAST::hilite_keyword : "") << " RENAME TO " << (settings.hilite ? IAST::hilite_none : "")
<< backQuote(new_short_name);
}
void formatAsRestrictiveOrPermissive(bool is_restrictive, const IAST::FormatSettings & settings)
{
settings.ostr << (settings.hilite ? IAST::hilite_keyword : "") << " AS " << (settings.hilite ? IAST::hilite_none : "")
<< (is_restrictive ? "restrictive" : "permissive");
}
void formatFilterExpression(const ASTPtr & expr, const IAST::FormatSettings & settings)
{
settings.ostr << " ";
if (expr)
expr->format(settings);
else
settings.ostr << (settings.hilite ? IAST::hilite_keyword : "") << "NONE" << (settings.hilite ? IAST::hilite_none : "");
}
void formatForClause(const boost::container::flat_set<std::string_view> & commands, const String & filter, const String & check, bool alter, const IAST::FormatSettings & settings)
{
settings.ostr << (settings.hilite ? IAST::hilite_keyword : "") << " FOR " << (settings.hilite ? IAST::hilite_none : "");
bool need_comma = false;
for (const auto & command : commands)
{
if (std::exchange(need_comma, true))
settings.ostr << ", ";
settings.ostr << (settings.hilite ? IAST::hilite_keyword : "") << command << (settings.hilite ? IAST::hilite_none : "");
}
if (!filter.empty())
settings.ostr << (settings.hilite ? IAST::hilite_keyword : "") << " USING" << (settings.hilite ? IAST::hilite_none : "") << filter;
if (!check.empty() && (alter || (check != filter)))
settings.ostr << (settings.hilite ? IAST::hilite_keyword : "") << " WITH CHECK" << (settings.hilite ? IAST::hilite_none : "") << check;
}
void formatForClauses(const std::vector<std::pair<RowPolicyFilterType, ASTPtr>> & filters, bool alter, const IAST::FormatSettings & settings)
{
std::vector<std::pair<RowPolicyFilterType, String>> filters_as_strings;
WriteBufferFromOwnString temp_buf;
IAST::FormatSettings temp_settings(temp_buf, settings);
for (const auto & [filter_type, filter] : filters)
{
formatFilterExpression(filter, temp_settings);
filters_as_strings.emplace_back(filter_type, temp_buf.str());
temp_buf.restart();
}
boost::container::flat_set<std::string_view> commands;
String filter, check;
do
{
commands.clear();
filter.clear();
check.clear();
/// Collect commands using the same filter and check conditions.
for (auto & [filter_type, str] : filters_as_strings)
{
if (str.empty())
continue;
const auto & type_info = RowPolicyFilterTypeInfo::get(filter_type);
if (type_info.is_check)
{
if (check.empty())
check = str;
else if (check != str)
continue;
}
else
{
if (filter.empty())
filter = str;
else if (filter != str)
continue;
}
commands.emplace(type_info.command);
str.clear(); /// Skip this condition on the next iteration.
}
if (!filter.empty() || !check.empty())
formatForClause(commands, filter, check, alter, settings);
}
while (!filter.empty() || !check.empty());
}
void formatToRoles(const ASTRolesOrUsersSet & roles, const IAST::FormatSettings & settings)
{
settings.ostr << (settings.hilite ? IAST::hilite_keyword : "") << " TO " << (settings.hilite ? IAST::hilite_none : "");
roles.format(settings);
}
}
String ASTCreateRowPolicyQuery::getID(char) const
{
return "CREATE ROW POLICY or ALTER ROW POLICY query";
}
ASTPtr ASTCreateRowPolicyQuery::clone() const
{
auto res = std::make_shared<ASTCreateRowPolicyQuery>(*this);
if (names)
res->names = std::static_pointer_cast<ASTRowPolicyNames>(names->clone());
if (roles)
res->roles = std::static_pointer_cast<ASTRolesOrUsersSet>(roles->clone());
/// `res->filters` is already initialized by the copy constructor of ASTCreateRowPolicyQuery (see the first line of this function).
/// But the copy constructor just copied the pointers inside `filters` instead of cloning.
/// We need to make a deep copy and not a shallow copy, so we have to manually clone each pointer in `res->filters`.
chassert(res->filters.size() == filters.size());
for (auto & [_, res_filter] : res->filters)
{
if (res_filter)
res_filter = res_filter->clone();
}
return res;
}
void ASTCreateRowPolicyQuery::formatImpl(const FormatSettings & settings, FormatState &, FormatStateStacked) const
{
if (attach)
{
settings.ostr << (settings.hilite ? hilite_keyword : "") << "ATTACH ROW POLICY";
}
else
{
settings.ostr << (settings.hilite ? hilite_keyword : "") << (alter ? "ALTER ROW POLICY" : "CREATE ROW POLICY")
<< (settings.hilite ? hilite_none : "");
}
if (if_exists)
settings.ostr << (settings.hilite ? hilite_keyword : "") << " IF EXISTS" << (settings.hilite ? hilite_none : "");
else if (if_not_exists)
settings.ostr << (settings.hilite ? hilite_keyword : "") << " IF NOT EXISTS" << (settings.hilite ? hilite_none : "");
else if (or_replace)
settings.ostr << (settings.hilite ? hilite_keyword : "") << " OR REPLACE" << (settings.hilite ? hilite_none : "");
settings.ostr << " ";
names->format(settings);
if (!storage_name.empty())
settings.ostr << (settings.hilite ? IAST::hilite_keyword : "")
<< " IN " << (settings.hilite ? IAST::hilite_none : "")
<< backQuoteIfNeed(storage_name);
formatOnCluster(settings);
assert(names->cluster.empty());
if (!new_short_name.empty())
formatRenameTo(new_short_name, settings);
if (is_restrictive)
formatAsRestrictiveOrPermissive(*is_restrictive, settings);
formatForClauses(filters, alter, settings);
if (roles && (!roles->empty() || alter))
formatToRoles(*roles, settings);
}
void ASTCreateRowPolicyQuery::replaceCurrentUserTag(const String & current_user_name) const
{
if (roles)
roles->replaceCurrentUserTag(current_user_name);
}
void ASTCreateRowPolicyQuery::replaceEmptyDatabase(const String & current_database) const
{
if (names)
names->replaceEmptyDatabase(current_database);
}
}
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